[Patch] [Makefile] Exit if provided an incorrect argument

[Florian Weimer]

* Matthew Malcomson:

> --- a/Makefile
> +++ b/Makefile
> @@ -148,6 +148,7 @@ while test $$# -gt 0 ; do
>        ;;
>      --*)
>        usage
> +      exit 1
>        ;;
>      *)
>        break

I think you should add the exit to the usage function.

Thanks,
Florian